Towards exploiting inelastic design for Inconel 625 under short-term cyclic loading at 600∘C

Cinoglu, I. Soner; Charbal, Ali; Vermaak, Natasha

doi:10.1016/j.mechmat.2019.103219

Cited by 5 publications

(1 citation statement)

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“…The attractive high temperature mechanical properties and corrosion resistance of nickel-based alloys make them to be one of the extensively used materials for engineering applications in aviation, shipbuilding and nuclear industries [1][2][3][4]. The industrial grade solid solution strengthened Inconel 625 (IN625) alloy with its high strength, corrosion and oxidation resistance at elevated temperatures (above 650 °C) is suitable for many applications in nuclear power generation plants like control rod and reactor core components [5][6][7].…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

An innovative constitutive material model for predicting high temperature flow behaviour of inconel 625 alloy

et al. 2022

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Inconel 625 nickel alloy with its attractive high-temperature strength, excellent corrosion and oxidation resistance is mainly used for critical applications in demanding environments, in both as-cast and wrought conditions. Hot processing of this alloy is crucial for achieving its tailored mechanical properties due to the significant variation in microstructural changes with varying process parameters like temperature, strain, and strain rate. In this study, isothermal hot compression tests were carried out at temperatures ranging from 900 to 1100 °C, and under strain rates ranging from 0.01 to 1 s−1. The flow curves revealed three stages of deformation, including a substantial work-hardening stage followed by dynamic recovery and flow softening. Microstructural observations showed the occurrence of discontinuous dynamic recrystallisation (DDRX) as the dominant recrystallisation mechanism during the flow softening. Microstructural analysis suggested that the DRX was more sensitive to the test temperature as compared to the strain rate. An innovative material's constitutive model was developed, by combining Johnson–Cook (JC) and Avrami approaches, to predict work-hardening, dynamic recovery, and flow softening stages of deformation. The predicted flow behavior was in a good agreement with the experimentally measured data. The developed material model was integrated into DEFORM® 3D finite element (FE) simulation software as a user subroutine for the prediction of deformation behaviour in a double truncated cone (DTC) sample. Comparison between the experimentally measured data and the results of FE simulation on the DTC sample showed a very good convergence, indicating the suitability of the proposed material’s constitutive model for large scale simulations. Graphical Abstract

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